TRANSMISSIVITY MEASURING METHOD AND DEVICE

Japanese Patent JP3814155

B2

PROBLEM TO BE SOLVED: To measure accurately and simply and transmissivity of an optical lens having refractive power. SOLUTION: In this transmissivity measuring method, the light transmissivity of a lens 30 to be tested is determined from a value corresponding to the ratio between the photodetection intensity by a photodetection means 50 when the lens 30 to be tested is interposed in an optical path along which measuring light L emitted from a light source 10 reaches the photodetection means 50, and the photodetection intensity by the photodetection means 50 when the lens 30 is not interposed. The method is characterized by converging measuring light L on the arrangement position of the lens 30 to be tested or near the lens 30 to be tested, and transmitting measuring light L through the lens 30.